Hello!
I'm working on full polysynth desig and need add a Keyboard Volume Balance control, like the korg ps-3200 (amp). I have read the service manual, but I could not understand how it works.
Someone could help me and explain how it works?

Hello!
I'm working on full polysynth desig and need add a Keyboard Volume Balance control, like the korg ps-3200 (amp). I have read the service manual, but I could not understand how it works.
Someone could help me and explain how it works?

Thanks!!!

Marco.

From memory (don't have the schomos in front of me):

There is s atring of resistors (series connection) and each end goes into a summing amplifier. Now each voice taps into a different position of this resistor string - lowest note on one end, highest note on the other end, middle note in the middle. Then a pot (or a set of two LDRs on the 3200) crossfades between the two summing amplifie routputs.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Thanks.
I analyzed the servive manual KORG PS3xxx series. I did the simulation and experimental tests. I will use the following circuit for my project. The balance could be achieved with the scheme is a "soft balance", but enough for my synth project.

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